The latter is indeed vital for progression with a research project, since you are usually given the state or educational establishment’s funding for the project, and useless, irrelevant endeavors solving no urgent problems and addressing no pressing needs are not given any value.
It also clearly points to the importance of the subject, program or event.
It lays out what you are attempting to establish, the point of what you intend to propose, how you will do it, and what needs to be completed in order for you to succeed.
To find the simple rationale definition, you first must understand why you are writing a rationale.
A rationale states the problem, defines key terms and notes objectives.